21524752 has 10 divisors (see below), whose sum is σ = 41704238. Its totient is φ = 10762368.

The previous prime is 21524749. The next prime is 21524753. The reversal of 21524752 is 25742512.

It can be written as a sum of positive squares in only one way, i.e., 14470416 + 7054336 = 3804^2 + 2656^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21524752.

It is not an unprimeable number, because it can be changed into a prime (21524753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672633 + ... + 672664.

Almost surely, 2^21524752 is an apocalyptic number.

It is an amenable number.

21524752 is a deficient number, since it is larger than the sum of its proper divisors (20179486).

21524752 is a wasteful number, since it uses less digits than its factorization.

21524752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345305 (or 1345299 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 21524752 is about 4639.4775567945. The cubic root of 21524752 is about 278.1715553426.

The spelling of 21524752 in words is "twenty-one million, five hundred twenty-four thousand, seven hundred fifty-two".